Coin-freed locking device for typewriters



COIN FREED LOCKING DEVICE FOR TYPEWRITERS Original Filed May 20, 1932 Patented Oct. 1, 1935 com-ransi) LOCKING DEVICE FOR TYPEWBITE S Karl Dletrloh, Hanover, German! Application May 20,'1932, sum No. 612,554. Behaved January 7,1935. In-Gernanmz3.

1 Chim- (Cl. IVI-198) This invention has for its Object to allow type'- wrlters to be used for a oertain time against pay: ment, for example in writing rooms oi hotels; homes and the like. l

Several'devices are known which serve the same' purpose, but which do not take' in oonsideration O the chief factor namely the collection oi money,

because the releasing' device oi the typewriting v mechanism, for example according to German Patent 304,861 and U. S, Al Patents 923,142 and 923,143, is arranged only for a certain number of letters or lines without taking into oonsideration the capability or' any intentions of the typist. In the case of a different arrangement, wherein the typewriting mechanism is released for a certain time. as in the present invention, the device as shown in GermanPatent 246,979 consists, similar to the ,above mentioned devices operating according to the number oi letters or lines written, oi a oomplicated meohanism which is brought into connection with certain parts of the typewriter'.

In both lnstances the devices require a' more or less great constructional alteration oi the typewriter according to the type of machine. Contrary to these known arrangements that accord-.

ing to the invention has no direct connection with the maohine and operates absolutely ireeiy and independently. .and also absolutely reliably because there are no connecti'ons. as those in the known devices by elastic arrangements oi diflerent types;

several embodlments oi' the inventlon are illustrated diagramnatically in the accompanying drawing in which:- l

Fig. l shows in elevation the device cooperating with the key bars, the looking-bar being in its exe treme lower position and controlled by a wedge.

Fig. 2 shows the device `with the looking bar in raised or looking position.-

Fig. 3 is a top plan'view of Figs. 1 and 2.

Fig. 4 shows amodlfled with looking bar controlled by a cam.

Flg. 5 shows a third form oi construction with looking bar controlled by an eccentric.

Fig; 6 shows a fourth form oi construction with looking bar controlled by a lever mechanism.

tance oi the key bar b (Figs. 1 and 2), or ii the construction oi the tw wr ter is such as to make it seem more praotical, 'to near the margi` stop, the releasing bar of the shiitingrneohanism or directly to the shiiting meohanism of the machine. The looking bar a, as shown in the drawing. may be constructed in various manners according to the shape or construction oi the key bars, oi the releasing bar or the like. The looking bar a has apincwhichisinsertedin atuhedinsucha form of construction I manner that it is shifted through the intermediary oi an adiusting'ring a by the tube d which can move ireely :up and down in a stationary guide tube e. The length of the pin cdepends upon the construction of the machine. The guide tube e, 5 the tube d and the pin c may -be of 'any desired cro -section. On the lower end of the tube d a rollerf (Figs. l to 4) -or a ball g' (Figs. 5 and 6) is arranged in such a manner that through the intermediary thereoi and with the aid oi a wedge- 10 shaped suriace h. of a shlftable plate (Figs. 1 to 3), or with the aid of a camz' (Flg. 4) or of an eccentric k (Fig. 5) or of a lever transmissionl (Fig. 6) the tube d is raised and lowered. The plate i is rigidly connected with a shiftable rod m (Flgs. 1

' key bar a, the releasing bar or the like.

Fig. l shows the looking bar a in inoperative or lowered position', in which the typewriter is 2.0 tree for use, whereas'in Figs. 2, 4, 5 and 6 the locking bar a is in operative or raised position looking the machina as the keybar-cannot be depressed.

The device above described is conneoted to a clock work and to a coin operated mechanism which is arranged in such a manner that the rod m can be' shitted in the direotion of the arrow (Fig. 2) and the typewritingmechanism liberated for use 'only after the insertion oi a coi'n. By shiiting the rod m.

a clockwork mechanism is' simultaneouslv woundso and set in operation. and a looking device prevents the returning of the rod m' and ol the plate i. After a certain adlustable time has elapsed, the clockwork disengages' the looking meohanism and a spring o (Fig. 3) pulls the rod m back into its initial position (Fig. 2) Thus, the tube d is again iited, the looking bar a beats against the key bars b, the releasing bars and the like and prevents the typewriter irom being used. a

The device is preferably arranged in a box un- 40 der the table on which the typewrlter is fixed, this p box being adapted to be locked.

A coin-freed device for looking l writers and :or releasing same for use for a predetermined period of time, comprising in combinatlon with movable elements oi the'typewriter, a guide element, a tubular transmission element shiftable in said guide element, a looking element exchangeably carried in one end of said tube, a rolingelement on the other end of said tube, and a cam contactlng with said rolling element and adapted to oooperate with said tubular transmission element to shilt said looking element into and out oi the range oi movement of said typewriter ele- 

